Where would you include a cedex number in a French address?

Answer 1

The cedex numbers are given out by the post offices to large organisations or companies receiving unusually large amouts of correspondence.

Add the cedex reference when you know it from the contact details of the sendee. You add the words "cedex .... (meaning the number)" at the end of the last address line (just after the Zip/postal code and town name, like

"75006 Paris cedex 3203"

Otherwise post your letter without any cedex information, it will still be delivered.

Answer 2

A cedex number is typically included on the third line of a French address, following the street address but before the city and postal code. It is used to indicate the specific distribution center or post office box to which mail should be sent within a larger administrative area.